Researchers from Stanford University examined the caffeine consumption and sleep patterns of 50 college students (they wore wrist monitors so that the researchers would know when they were experiencing a period of wakefulness during sleep), MyHealthNewsDaily reported.

The researchers found that after consuming caffeine during the day, the late sleepers were less likely to have disrupted sleep than the people who woke up early, according to MyHealthNewsDaily.

According to ABC News, a recent round-up of the research on caffeine in The Cochrane Library showed that the stimulant largely helps to improve memory and performance, and can even help people concentrate better.

However, Dr. Donna Arand, clinical director of the Kettering Sleep Disorder Center, told ABC News that there is evidence that caffeine can affect how long it takes you to fall asleep.

Recently, we reported on a new smartphone app called "Caffeine Zone," which can help people figure out when they should stop drinking their caffeine-source-of-choice in order to get a good night's rest.

"Many people don't understand how caffeine levels in their bloodstream go up and how they go down," Frank Ritter, a professor at Penn State University, said in a statement. "It's important to understand the effect that caffeine can have at these various levels."

For more effects of caffeine on our bodies, make sure to read our piece here. And click through the slideshow to see how much caffeine is in your favorite drinks:

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Caffeine In Drinks

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100 to 200mg per 8 ounces, according to the Center for Science in the Public Interest (CSPI)

27 to 173mg per 8 ounces, according to CSPI

23mg per 8 ounces
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25mg per 8 ounces
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31mg per 8 ounces
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24mg per 8 ounces
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36mg per 8 ounces
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23mg per 8 ounces
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28mg per 8 ounces
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28mg per 8 ounces
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40 to 120mg per 8 ounces, according to CSPI

30 to 90mg per 1 ounce, according to CSPI

"Comparable to a cup of premium coffee," according to 5hourenergy.com, which would be about 160mg, according to CSPI.
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